STI571、三氧化二砷和Velcade对bcr/abl+-CD34+细胞增殖、凋亡的影响

目的 研究STI571、三氧化二砷(As2O3)和Velcade在单独及联合应用时对bcr/abl -CD34 细胞增殖、凋亡的影响.方法 提取慢性粒细胞白血病患者骨髓的bcr/abl -CD34 细胞,用STI571、As2O3、Velcade单独及联合处理96 h,通过CCK-8分析及流式细胞术分别检测细胞增殖、凋亡的变化,并用Hoechst33342染色及荧光显微镜技术观察凋亡细胞形态学改变.同时检测上述方案对正常骨髓CD34 细胞的抑制作用.结果 STI571、As2O3及Velcade对bcr/abl -CD34 细胞的作用呈剂量依赖性,其中在低浓度时以抑制增殖作用为主,促凋亡作用不明显.当0.25～2 μmol/L STI571分别与2.5 μmol/LAs2O3及15nmol/L Velcade联合后,抑制率和凋亡率均显著提高,呈相加或协同作用,且对正常CD34 细胞的抑制作用无进一步增强.结论 As2O3及Velcade与STI571联合能够增强对BCR/ABL -CD34 细胞的作用,具有一定临床意义.

STI571 enhances the effect of arsenic trioxide and Velcade on bcr/abl+-CD34+ cell proliferation and apoptosis

OBJECTIVE: To study the effects of STI571, arsenic trioxide (As2O3) and Velcade, used alone or in combination, on the proliferation and apoptosis of bcr/abl+-CD34+ cells. METHODS: bcr/abl+-CD34+ cells isolated from the bone marrow of patients with chronic myeloid leukemia (CML) were treated for 96 h with STI571, As2O3 and Velcade either alone and in combination, and the cell proliferation and apoptosis were analyzed by CCK-8 assay and flow cytometry. The morphological changes of the apoptotic cells were observed by Hoechst33342 staining and fluorescent microscope. The inhibitory effects of the drugs on normal CD34+ cells were also observed. RESULTS: Low-concentration STI571, As2O3 or Velcade all dose-dependently inhibited bcr/abl+-CD34+ cell proliferation without obvious apoptosis-inducing effects. STI571 at 0.25-2 micromol/L combined with As2O3 at 2.5 micromol/L and with Velcade at 15 nmol/L both significantly increased the cell inhibition and apoptosis rates, showing obvious additive or synergistic effects of the drugs without further enhancement of normal CD34+ cell inhibition. CONCLUSION: Combination with STI571 enhances the effects of As2O3 and Velcade on bcr/abl+-CD34+ cells, suggesting the potential clinical value of this regimen.